Agilent Technologies 8564EC Service Manual page 416

Synthesizer Section
Unlocked Offset Lock Loop (Sampling Oscillator)
6. The voltage required to tune the oscillator should measure between
7. Vary the voltage to tune the sampling oscillator to 296 MHz.
8. Use an active probe/spectrum analyzer combination to measure the
A15TP402
9. If the signal is not measured near the indicated power, troubleshoot
Table 11-4 Sampling Oscillator PLL Divide Numbers
Sampling
Oscillator
Frequency
(MHz)
285.000
286.364
287.500
288.462
288.888
290.000
290.909
291.666
292.500
293.478
294.444
295.000
296.000
296.471
297.000
297.222
* To set the sampling oscillator to a desired frequency, set span
10.Measure the 296 MHz loop feedback signal at the following test
A15TP400
548
+15 Vdc and +19 Vdc. If the voltage is out of this range, perform the
sampling oscillator adjustment in Chapter 2.
300 MHz LO signal at the following test point. Refer to function
block AI of A15 RF schematic (sheet 3 of 4).
the offset lock loop buffer (function block AM of A15 RF schematic
sheet 3 of 4).
Center
Frequency*
(MHz)
2156.3
2176.3
2199.5
2230.3
799.3
2263.3
2282.3
2302.3
2155.3
2158.3
2336.3
2196.3
1.3
2378.3
2410.3
2422.3
to 0 Hz and CENTER FREQ to the value listed in the table.
point:
+7 dBm
Reference Divide Chain
Prescaler Postscaler
10 2
11 2
8 3
13 2
9 3
10 3
11 3
9 4
8 5
23 2
9 6
10 6
15 5
17 5
20 5
18 6
+2 dBm
Reference
Frequency
(MHz)
15.000
13.636
12.500
11.538
11.111
10.000
9.091
8.333
7.500
6.522
5.556
5.000
4.000
3.529
3.000
2.778
Chapter 11